So here we are, plugging away our new App – Oyster Errors – where you can look up what the mysterious numbers mean on barriers if it beeps at you with a problem, when we’ve had a report in from the field, that some gates are now starting to show the full error to explain what it means, and not just the number!
Error 21
This from Jonathan Rothwell who sent in this picture from the gateline at Willesden Green, where error code 21 is indeed ‘Card used already’. It’s the only place we’ve been made aware of it so far, but we’ll keep an eye out to see if it spreads to the rest of the network.